A mass m is traveling at an initial speed of 25.0 m/s. It is brought to rest in a distance of 62.5 m by a net force of 15.0 N. The mass is
A) 37.5 kg.
B) 3.00 kg.
C) 1.50 kg.
D) 6.00 kg.
E) 3.75 kg.

Question

Quizplus · Accepted Answer

Using the work-energy principle, the work done by the force is equal to the change in kinetic energy. The work done is force times distance (15 N * 62.5 m = 937.5 J). The initial kinetic energy is (1/2)mv^2 = (1/2)m(25)^2. Setting these equal gives m = 3.00 kg.

A Mass M Is Traveling at an Initial Speed of 25.0